205109816 has 16 divisors (see below), whose sum is σ = 390886440. Its totient is φ = 100873440.

The previous prime is 205109813. The next prime is 205109843. The reversal of 205109816 is 618901502.

205109816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205109813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209666 + ... + 210641.

Almost surely, 2^205109816 is an apocalyptic number.

It is an amenable number.

205109816 is a deficient number, since it is larger than the sum of its proper divisors (185776624).

205109816 is a wasteful number, since it uses less digits than its factorization.

205109816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420374 (or 420370 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 205109816 is about 14321.6554908991. The cubic root of 205109816 is about 589.7421222930.

The spelling of 205109816 in words is "two hundred five million, one hundred nine thousand, eight hundred sixteen".